#include "Date.h"

#define _CRT_SECURE_NO_WARNINGS 1

Date& Date::operator+=(int day)
{
	if (day < 0)
	{
		return *this -= (-day);
	}

	_day += day;
	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		++_month;
		if (_month == 13)
		{
			_year++;
			_month = 1;
		}
	}
	return *this;
}
Date Date::operator+(int day) const
{
	Date tmp = *this;
	tmp += day;

	return tmp;
}


Date& Date::operator-=(int day)
{
	_day -= day;
	while(_day <= 0)
	{
		--_month;
		if (_month == 0)
		{
			--_year;
			_month = 12;
		}
		
		_day += GetMonthDay(_year, _month);
	}

	return *this;
}

Date Date::operator-(int day) const
{
	Date tmp = *this;
	tmp -= day;

	return tmp;
}

//d1<d2
bool Date::operator<(const Date& d) const
{
	if (_year < d._year)
	{
		return true;
	}
	else if (_year==d._year)
	{
		if (_month < d._month)
		{
			return true;
		}
		else if (_month==d._month)
		{
			if (_day < d._day)
			{
				return true;
			}
		}
	}

	return false;
}

//d1<=d2
bool Date::operator<=(const Date& d) const
{
	return *this<d || *this==d;
}

bool Date::operator>(const Date& d) const
{
	return !(*this <= d);
}

bool Date::operator>=(const Date& d) const
{
	return !(*this < d);
}

bool Date::operator==(const Date& d) const
{
	return _year == d._year
		&& _month == d._month
		&& _day == d._day;
}

bool Date::operator!=(const Date& d) const
{
	return !(*this == d);
}

Date Date::operator++(int)
{
	Date tmp = *this;
	*this += 1;
	return tmp;
}

Date& Date::operator++()
{
	*this += 1;
	return *this;
}

Date Date::operator--(int)
{
	Date tmp = *this;
	*this -= 1;
	return tmp;
}

Date& Date::operator--()
{
	*this -= 1;
	return *this;
}
//d1-d2
int Date::operator-(const Date& d) const
{
	int flag = 1;
	Date max = *this;
	Date min = d;
	if (*this < d)
	{
		Date max = d;
		Date min = *this;
		flag = -1;
	}
	int n = 0;
	while (min!=max)
	{
		++min;
		++n;
	}

	return n * flag;
}









